用简便方法计算. 15.3+0.86+0.14+4.7 147×8+8×53 6900÷25÷4 25.3-8.1-10.9.
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(1)15.3+0.86+0.14+4.7,
=(15.3+4.7)+(0.86+0.14),
=20+1,
=21;
(2)147×8+8×53,
=(孝哗147+53)×8,
=200×8,
=1600;
(3)6900÷25÷4,
=6900÷(25×4),
=6900÷100,
=69;
(御谈4)25.3-8.1-10.9,
=25.3-(8.1+10.9),
=25.3-19,巧拆行
=6.3.
=(15.3+4.7)+(0.86+0.14),
=20+1,
=21;
(2)147×8+8×53,
=(孝哗147+53)×8,
=200×8,
=1600;
(3)6900÷25÷4,
=6900÷(25×4),
=6900÷100,
=69;
(御谈4)25.3-8.1-10.9,
=25.3-(8.1+10.9),
=25.3-19,巧拆行
=6.3.
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